Thin film supply mechanism for cold-stretching film-sleeving packaging machine and supply method of thin film supply mechanism

Abstract

The invention discloses a thin film supply mechanism for a cold-stretching film-sleeving packaging machine and a supply method of the thin film supply mechanism. The thin film supply mechanism comprises two racks, and an unwinding roller is rotationally installed between upper fixing frames; the mounting frame is arranged at the middle position of the rear end of the rack; the lower fixing frame is arranged below the front end of the machine frame, adjusting mechanisms are fixedly installed on the outer sides of the lower fixing frame, a movable frame is installed between the two adjusting mechanisms, the movable frame vertically reciprocates along with rotation of the roller through a lifting transmission mechanism, connecting frames are symmetrically installed in the movable frame in the front-back direction, and the connecting frames are connected with the lower fixing frame. Through the lifting transmission mechanism, the distance between the two connecting frames is continuously increased in the ascending process of the movable frame, and on the contrary, the distance between the two connecting frames is continuously reduced in the descending process of the movable frame. The problems that dust and impurities are prone to being attached to the surfaces of the films in the supply process, and follow-up packaging quality is affected due to unevenness are solved.

Description

Technical Field

[0001] The invention relates to the technical field of cold stretch hood packaging machines, in particular to a film supply mechanism and a supply method thereof for a cold stretch hood packaging machine. Background Art

[0002] The film feeding mechanism of the cold stretch hood packaging machine is a key component of the cold stretch hood packaging machine. It is responsible for continuously and stably feeding the film to the stretching and hooding mechanism of the packaging machine. The film feeding mechanism usually includes one or more film storage devices, such as film roll racks or film boxes, which are used to store the film rolls to be used. Through a series of conveying devices (such as rollers, chains, conveyor belts, etc.), the film is led out of the storage device and conveyed to the stretching and hooding mechanism. In order to ensure that the film maintains appropriate tension during transportation, the feeding mechanism may be equipped with a tension control system, which is achieved by adjusting the speed of the conveying device or applying a certain traction force.

[0003] For example, the Chinese authorized patent "A film feeding mechanism of a cold stretch hood packaging machine" with announcement number CN208412307U includes a frame, a film feeding bracket, a film traction device, a lifting platform and a driving device capable of driving the lifting platform to move up and down. The film traction device is installed on the film feeding bracket, the lifting driving device is installed at the bottom of the frame, and the film feeding bracket is above the lifting platform; the film feeding bracket is provided with a plurality of positioning mechanisms, the positioning mechanisms include positioning members and a position switching device capable of switching the position of the positioning members, the position switching device is installed on the film feeding bracket, and a plurality of clamping members are provided on the top of the frame, the number of the clamping members is the same as that of the positioning mechanisms and they correspond one to one, and the clamping members can be snapped with the positioning members of the corresponding positioning mechanisms. The film feeding mechanism of this cold stretch hood packaging machine can be raised and lowered, and the center of gravity of the equipment can be lowered during transportation to ensure the safety of transportation.

[0004] Although the above-mentioned prior art can realize the lifting and lowering adjustment of the film feeding device, during the film feeding process, due to the influence of its own production quality and processing environment, dust and impurities are easily attached to the surface, which will affect the weight of the product after product packaging. In addition, during the feeding process, the surface of the film is prone to unevenness, which not only affects the packaging effect, but also causes an increase in production costs. Therefore, it does not meet the existing needs. In this regard, we propose a film feeding mechanism and a feeding method for a cold stretch hood packaging machine. Summary of the invention

[0005] The object of the present invention is to provide a film supply mechanism and supply method for a cold stretch hood packaging machine, so as to solve the problem in the above background technology that dust and impurities are easily attached to the surface of the film during the supply process and the film becomes uneven, which affects the subsequent packaging quality.

[0006] To achieve the above object, the present invention provides the following technical solution: a film supply mechanism for a cold stretch hood packaging machine, comprising two frames, each of which is provided with an upper fixing frame extending backward at the upper end of the inner side of the frame, and a reeling roller is rotatably installed between the upper fixing frames; and further comprising:

[0007] A mounting frame is arranged at the middle position of the rear end of the frame, and the mounting frame is fixed to the frame by bolts, a roller is rotatably mounted on one side of the upper horizontal plate of the mounting frame, a silicone sleeve pressure roller shaft rotatably connected to the upper horizontal plate of the mounting frame is arranged below the roller, a supply motor is installed outside the upper horizontal plate of the mounting frame, and the output shaft of the supply motor is fixed to the shaft of the roller by a coupling;

[0008] A lower fixed frame is arranged below the front end of the frame, and an adjusting mechanism is fixedly installed on the outer side of the lower fixed frame, and a movable frame is installed between the two adjusting mechanisms, and the movable frame and the adjusting mechanism are slidably limited. Through the lifting transmission mechanism, the movable frame is vertically reciprocated with the rotation of the roller, and connecting frames are symmetrically installed front and back inside the movable frame, and straightening mechanisms are installed on both sides of the connecting frame. Through the lifting transmission mechanism, the distance between the two connecting frames is continuously expanded during the rising process of the movable frame, and conversely, the distance between the two connecting frames is continuously reduced during the descending process of the movable frame.

[0009] Preferably, a driving pulley is fixedly installed on the other end of the roller, a transmission pulley is rotatably installed at the middle position of one side of the frame, and the driving pulley and the transmission pulley are connected by belt transmission, a driven pulley is installed below the transmission pulley, the driven pulley is rotatably connected to the frame, and the driven pulley and the transmission pulley are connected by belt transmission, a driving bevel gear is fixedly installed on one side of the driven pulley, a driven bevel gear is meshingly installed at the front end of the driving bevel gear, and the shaft of the driven bevel gear is rotatably connected to the adjusting mechanism.

[0010] Preferably, the lifting transmission mechanism includes a fan-shaped gear, which is arranged above the inside of the adjusting mechanism, and the shaft of the driven bevel gear is connected to the fan-shaped gear through a belt drive. A driving gear is rotatably installed at the bottom inside the adjusting mechanism, and a first rack plate is fixedly installed on both sides of the movable frame, and the first rack plate is independently meshed with the fan-shaped gear and the driving gear respectively.

[0011] Preferably, the lifting transmission mechanism also includes a second rack plate, the second rack plate is fixed to the adjusting mechanism through a fixing rod, and the lower end of the second rack plate extends to the interior of the movable frame, double-threaded transmission rods are rotatably installed on both sides of the interior of the movable frame, a first transmission gear is fixedly installed at the middle position of the double-threaded transmission rod, and one side of the first transmission gear is meshed and connected with the second rack plate, a first slider is installed at the front and rear of the outside of the double-threaded transmission rod, the inner screw hole of the first slider is threadedly connected to the double-threaded transmission rod, and the two ends of the connecting frame are respectively fixed to the first slider.

[0012] Preferably, the straightening mechanism comprises two transmission rollers, and the transmission rollers are rotatably connected to the connecting frame, a contact belt is installed between the two transmission rollers, and one of the transmission rollers is driven by a motor.

[0013] Preferably, a film cleaning mechanism is provided between the middle positions of the two frames, a driving gear is rotatably installed on the upper part inside the film cleaning mechanism, a driven gear is rotatably installed on the lower part inside the film cleaning mechanism, and the driving gear is meshingly connected with the driven gear, the shaft on the inner side of the driving pulley and the shaft of the driving gear are fixed by a coupling, cleaning rollers are installed on the shafts at the other ends of the driving gear and the driven gear, and the cleaning rollers are hollow structures, a plurality of felts equidistantly distributed in an annular shape are provided on the outer wall of the cleaning roller, adsorption grooves connected with the hollow cavity of the cleaning roller are provided between adjacent felts, a vacuum tube is installed on the other end of the cleaning roller, and the vacuum tube is rotatably sealed with the cleaning roller, and the other end of the vacuum tube is connected to a dust collecting device.

[0014] Preferably, a tension detection mechanism is provided at the front end of the roller, and the tension detection mechanism includes two tension rollers spaced apart up and down, and limit slide grooves are provided above and below the inside of the tension detection mechanism, a screw is rotatably installed inside the limit slide groove, a second slider is installed outside the screw, the internal thread of the second slider is threadedly connected to the screw, and the outer side of the second slider is connected to the tension roller through a rotating shaft, and the upper and lower ends of the tension detection mechanism are provided with adjusting nuts connected to the screw, and a detection groove is provided at the position of the tension detection mechanism corresponding to the horizontal plate on the mounting frame, a rotating shaft is rotatably installed inside the detection groove, and one end of the rotating shaft is fixed to the tension detection mechanism, and detection protrusions are integrally formed on both sides of the rotating shaft, a spring is installed between the detection protrusion and the detection groove, and pressure sensors fixed to the detection groove are provided at both ends of the spring.

[0015] Preferably, a mold adjusting frame is installed at the upper end of the outer side of the frame, and one end of the mold adjusting frame is fixed to the frame by an adjusting bolt, and a mold adjusting shaft is installed between the other ends of the two mold adjusting frames.

[0016] Preferably, a bottom roller is installed on the inner side of the lower vertical plate of the mounting frame.

[0017] A feeding method of a film feeding mechanism for a cold stretch hood packaging machine comprises the following steps:

[0018] Step 1: Driven by the supply motor, the roller is driven to rotate, and the silicone sleeve presses the roller shaft to release the film from the unwinding roller;

[0019] Step 2: After passing through the bottom roller, the film enters the tension detection mechanism. The film passes through the tension roller on the tension detection mechanism in an S shape, and the tension is determined by the inclination of the tension detection mechanism. The controller is used to adjust the supply motor to keep the tension of the film constant during the supply process.

[0020] Step 3: After the tension is adjusted, the film enters the film cleaning mechanism. The cleaning roller on the film cleaning mechanism rotates synchronously with the rotation of the roller, and the felt on the surface is used to clean the dust and impurities passing through the felt. At the same time, the inner cavity of the cleaning roller is kept at a negative pressure through a vacuum tube, and the cleaned dust and impurities are adsorbed and collected through the adsorption groove;

[0021] Step 4: The surface cleaning film passes through the top of the mold adjustment shaft and is transported downward in a vertical position to the horizontal plane;

[0022] Step 5. After entering the movable frame, with the cooperation of the lifting transmission mechanism, the movable frame and the film descend at the same speed, and at the same time, the internal straightening mechanisms approach each other until the film is attached, and the contact belt in the straightening mechanism moves outward to continuously smooth the surface of the film. After moving down to the set distance, the straightening mechanism and the film are automatically separated, and the movable frame is lifted and reset, and the above steps are repeated.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. The present invention is provided with a film flatness processing mechanism. Under the drive of the supply motor, the roller is driven to rotate, and the film in the unwinding roller is released in cooperation with the silicone sleeve pressure roller shaft. During the rotation of the roller, the driving pulley drives the transmission pulley to rotate under the cooperation of the belt, and the driven pulley below is driven to rotate through the belt outside, thereby driving the driving bevel gear to rotate synchronously, and the connection with the driven bevel gear drives the shaft on which it is located to rotate, and further uses the belt transmission to realize the rotation of the fan gear. When the outer gear ring of the fan gear is engaged with the first rack plate on one side of the movable frame, it will drive the movable frame to move in a vertical direction, and then the fan gear loses engagement with the first rack plate and engages with the driving gear at the same time, so that the driving gear drives the first rack plate to move vertically in the opposite direction. With the continuous driving of the supply motor, the fan gear The movable frame reciprocates in the vertical direction. During the movement of the movable frame, the internal first transmission gear meshes with the second rack plate fixed by the external adjustable mechanism. When the first transmission gear rotates in one direction, it synchronously drives the double-threaded transmission rod to rotate, and converts the rotational motion into linear motion under the friction with the thread of the first slider. Therefore, during the descent of the movable frame, the two sets of connecting frames are brought closer, and at the same time, the motor on the transmission roller in the straightening mechanism remains turned on, driving the contact belt on the surface to move outward. Then, in the process of contacting the film, the film can be flattened to avoid surface wrinkles affecting the packaging quality. In addition, the movable frame and the film keep moving at the same speed during this process. The contact belt can avoid tearing and pulling of the film during the straightening process, thereby achieving flatness processing without affecting the normal supply of the film.

[0025] 2. The present invention is provided with a film cleaning mechanism. In the process of the supply motor driving the active pulley on the roller to rotate, the transmission pulley is driven to rotate by the belt, thereby realizing the rotation of the active gear. Under the meshing with the driven gear, the two cleaning rollers are made to rotate in opposite directions and at the same speed. During the movement, the film passes between the two cleaning rollers. By providing a felt on the surface of the cleaning roller, the felt contacts with the two surfaces of the film during the rotation process, and the dust and impurities attached to the surface can be cleaned under the friction effect. At the same time, the cleaning roller is a hollow structure, and the surface is provided with an adsorption groove connected to it. By assembling a negative pressure pump, when the negative pressure pump is turned on, the air inside the cleaning roller is discharged through the vacuum tube, and negative pressure is formed in the adsorption groove to adsorb the external air. Then, the dust and impurities cleaned by the felt can enter the cleaning roller through the adsorption groove, and then be discharged from the vacuum tube to the collection container. The film cleaning mechanism can cooperate with the supply mechanism to ensure that the film is kept clean during the film supply process, providing a prerequisite for the cleaning processing of the product.

[0026] 3. The present invention is provided with a tension detection mechanism. During the supply process, the film passes through the two tension rollers of the tension detection mechanism in an S shape. Under the support of the spring, the detection protrusion of the film will not contact the pressure sensor under normal tension. If the tension is too high or too low, the tension roller will drive the tension detection mechanism to tilt, causing the detection protrusions on both sides of the rotating shaft to move in the detection groove. When the detection protrusion contacts the pressure sensor, it indicates that the tension exceeds the set threshold. The supply motor is adjusted in time through the single-chip microcomputer to ensure the stability of the film supply tension. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A perspective view of the present invention;

[0028] Figure 2 A top view of the present invention;

[0029] Figure 3 is a side view of the present invention;

[0030] Figure 4 It is a front view of the present invention;

[0031] Figure 5 A top view of the internal structure of the movable frame of the present invention;

[0032] Figure 6 A top view of the internal structure of the adjustment mechanism of the present invention;

[0033] Figure 7 It is a partial stereoscopic diagram of the tension detection mechanism of the present invention;

[0034] Figure 8 It is a schematic diagram of the internal structure of the tension detection mechanism of the present invention;

[0035] Fig. 9 It is a schematic diagram of the transmission structure of the film cleaning mechanism of the present invention;

[0036] Fig.10 It is a schematic diagram of the internal structure of the cleaning roller of the present invention.

[0037] In the figure: 1, frame; 2, upper fixed frame; 3, unwinding roller; 4, roller; 5, silicone sleeve pressure roller shaft; 6, supply motor; 7, tension detection mechanism; 8, bottom roller; 9, film cleaning mechanism; 10, mold adjustment frame; 11, mold adjustment shaft; 12, lower fixed frame; 13, adjustment mechanism; 14, movable frame; 15, first rack plate; 16, second rack plate; 17, first transmission gear; 18, mounting frame; 19, tension roller; 20, cleaning roller; 21, driving pulley; 22, driving pulley; 23, driven pulley; 24, Driving bevel gear; 25, driven bevel gear; 26, double-threaded transmission rod; 27, first slider; 28, connecting frame; 29, straightening mechanism; 30, transmission roller; 31, contact belt; 32, fan gear; 33, driving gear; 34, limiting slide groove; 35, screw; 36, second slider; 37, adjusting nut; 38, rotating shaft; 39, detection bump; 40, detection groove; 41, pressure sensor; 42, spring; 43, driving gear; 44, driven gear; 45, vacuum tube; 46, felt; 47, adsorption groove. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0039] See also Figure 1-10 The present invention provides an embodiment: a film supply mechanism for a cold stretch hood packaging machine, comprising two frames 1, each of which is provided with an upper fixed frame 2 extending backward at the inner upper end of each frame 1, and a reeling roller 3 is rotatably installed between the upper fixed frames 2, and a mold adjusting frame 10 is installed at the outer upper end of each frame 1, and one end of the mold adjusting frame 10 is fixed to the frame 1 by an adjusting bolt, and a mold adjusting shaft 11 is installed between the other ends of the two mold adjusting frames 10, and a bottom roller 8 is installed on the inner side of the lower vertical plate of the mounting frame 18; and further comprising:

[0040] The mounting frame 18 is arranged at the middle position of the rear end of the frame 1, and the mounting frame 18 is fixed to the frame 1 by bolts. The roller 4 is rotatably mounted on one side of the upper horizontal plate of the mounting frame 18, and a silicone sleeve pressure roller shaft 5 rotatably connected to the upper horizontal plate of the mounting frame 18 is provided below the roller 4. The supply motor 6 is installed outside the upper horizontal plate of the mounting frame 18, and the output shaft of the supply motor 6 is fixed to the shaft of the roller 4 by a coupling;

[0041] The lower fixed frame 12 is arranged below the front end of the frame 1, and the outer side of the lower fixed frame 12 is fixedly installed with an adjusting mechanism 13, and a movable frame 14 is installed between the two adjusting mechanisms 13, and the movable frame 14 and the adjusting mechanism 13 are slidably limited. Through the lifting transmission mechanism, the movable frame 14 is vertically reciprocated as the roller 4 rotates. Connecting frames 28 are symmetrically installed front and back inside the movable frame 14, and straightening mechanisms 29 are installed on both sides of the connecting frames 28. Through the lifting transmission mechanism, during the rising process of the movable frame 14, the distance between the two connecting frames 28 is continuously expanded, and conversely, during the descending process of the movable frame 14, the distance between the two connecting frames 28 is continuously reduced.

[0042] See also Figure 2 , Figure 3 and Figure 4 A driving pulley 21 is fixedly installed on the other end of the roller 4, and a driving pulley 22 is rotatably installed at the middle position of one side of the frame 1, and the driving pulley 21 is connected to the driving pulley 22 by belt transmission, and a driven pulley 23 is installed below the driving pulley 22, and the driven pulley 23 is rotatably connected to the frame 1, and the driven pulley 23 is connected to the driving pulley 22 by belt transmission, and a driving bevel gear 24 is fixedly installed on one side of the driven pulley 23, and a driven bevel gear 25 is meshed and installed at the front end of the driving bevel gear 24, and the shaft of the driven bevel gear 25 is rotatably connected with the adjusting mechanism 13. During the rotation of the roller 4, the driving pulley 21 drives the driving pulley 22 to rotate under the cooperation of the belt, and the driven pulley 23 below is driven to rotate by the belt outside thereof, thereby driving the driving bevel gear 24 to rotate synchronously, and the connection with the driven bevel gear 25 drives the shaft where it is located to rotate, and further utilizes the belt transmission to realize the rotation of the sector gear 32.

[0043] See also Figure 6 The lifting transmission mechanism includes a sector gear 32, which is arranged above the inside of the adjusting mechanism 13, and the shaft of the driven bevel gear 25 is connected to the sector gear 32 through a belt drive. A driving gear 33 is rotatably installed at the bottom of the adjusting mechanism 13. First rack plates 15 are fixedly installed on both sides of the movable frame 14, and the first rack plates 15 are independently meshed with the sector gear 32 and the driving gear 33. When the outer gear ring of the sector gear 32 is meshed with the first rack plate 15 on one side of the movable frame 14, the movable frame 14 will be driven to move in a vertical direction. Then the sector gear 32 loses the meshing with the first rack plate 15 and meshes with the driving gear 33 at the same time, so that the driving gear 33 drives the first rack plate 15 to move vertically in the opposite direction. With the continuous driving of the supply motor 6, the movable frame 14 is reciprocated in the vertical direction.

[0044] See also Figure 5The lifting transmission mechanism also includes a second rack plate 16, which is fixed to the adjustment mechanism 13 through a fixing rod, and the lower end of the second rack plate 16 extends to the inside of the movable frame 14. Double-threaded transmission rods 26 are rotatably installed on both sides of the inside of the movable frame 14. A first transmission gear 17 is fixedly installed at the middle position of the double-threaded transmission rod 26, and one side of the first transmission gear 17 is meshed and connected with the second rack plate 16. First sliders 27 are installed at the front and back of the outside of the double-threaded transmission rod 26. The inner screw hole of the first slider 27 is threadedly connected to the double-threaded transmission rod 26, and the two ends of the connecting frame 28 are respectively fixed to the first slider 27. During the movement of the movable frame 14, the internal first transmission gear 17 is meshed with the second rack plate 16 fixed by the external adjustment mechanism 13. When the first transmission gear 17 rotates in one direction, it synchronously drives the double-threaded transmission rod 26 to rotate, and converts the rotational motion into linear motion under the friction with the thread of the first slider 27, so that the two groups of connecting frames 28 are close to each other during the descent of the movable frame 14.

[0045] See also Figure 5 The straightening mechanism 29 includes two transmission rollers 30, and the transmission rollers 30 are rotatably connected to the connecting frame 28. A contact belt 31 is installed between the two transmission rollers 30, and one of the transmission rollers 30 is driven by a motor. The motor on the transmission roller 30 in the straightening mechanism 29 remains turned on, driving the surface contact belt 31 to move outward, so that in the process of contacting the film, the film can be flattened to avoid surface wrinkles affecting the packaging quality. In this process, the movable frame 14 and the film keep moving at the same speed, and the contact belt can avoid tearing and pulling of the film during the straightening process, thereby achieving flatness processing without affecting the normal supply of the film.

[0046] See also Figure 1 , Figure 2 , Fig. 9 and Fig.10A film cleaning mechanism 9 is arranged between the middle positions of the two frames 1, a driving gear 43 is rotatably installed on the upper part of the film cleaning mechanism 9, a driven gear 44 is rotatably installed on the lower part of the film cleaning mechanism 9, and the driving gear 43 is meshed and connected with the driven gear 44, the shaft on the inner side of the driving pulley 21 is fixed to the shaft of the driving gear 43 by a coupling, a cleaning roller 20 is installed on the shaft at the other end of the driving gear 43 and the driven gear 44, and the cleaning roller 20 is a hollow structure, a plurality of felts 46 are arranged on the outer wall of the cleaning roller 20 in an annular and equidistant manner, an adsorption groove 47 connected to the hollow cavity of the cleaning roller 20 is arranged between adjacent felts 46, a vacuum tube 45 is installed on the other end of the cleaning roller 20, and the vacuum tube 45 is rotatably sealed with the cleaning roller 20, the other end of the vacuum tube 45 is connected to the dust collecting device, and the supply motor 6 drives the driving pulley on the roller 4 During the rotation of 21, the transmission pulley 22 is driven by the belt to rotate, thereby realizing the rotation of the driving gear 43. Under the meshing with the driven gear 44, the two cleaning rollers 20 are rotated in opposite directions and at the same speed. During the movement, the film passes between the two cleaning rollers 20. A felt 46 is provided on the surface of the cleaning roller 20. The felt 46 contacts the two surfaces of the film during the rotation, and the dust and impurities attached to the surface can be cleaned under the friction. At the same time, the cleaning roller 20 is a hollow structure, and an adsorption groove 47 is provided on the surface to communicate with it. By assembling a negative pressure pump, when the negative pressure pump is turned on, the air inside the cleaning roller 20 is discharged through the vacuum tube 45, and a negative pressure is formed in the adsorption groove 47 to adsorb the external air. Then, the dust and impurities cleaned by the felt 46 can enter the inside of the cleaning roller 20 through the adsorption groove 47, and then be discharged from the vacuum tube 45 to the collection container.

[0047] See also Figure 1 , Figure 7 and Figure 8A tension detection mechanism 7 is provided at the front end of the roller 4. The tension detection mechanism 7 includes two tension rollers 19 spaced apart from each other. A limit slide 34 is provided at the upper and lower parts of the tension detection mechanism 7. A screw 35 is rotatably installed inside the limit slide 34. A second slider 36 is installed outside the screw 35. The internal thread of the second slider 36 is threadedly connected to the screw 35, and the outer side of the second slider 36 is connected to the tension roller 19 through a rotating shaft. An adjusting nut 37 connected to the screw 35 is provided at the upper and lower ends of the tension detection mechanism 7. A detection groove 40 is provided at the position of the horizontal plate on the mounting frame 18 corresponding to the tension detection mechanism 7. A rotating shaft 38 is rotatably installed inside the detection groove 40, and one end of the rotating shaft 38 is fixed to the tension detection mechanism 7. Detection convex blocks 39 are integrally formed on both sides of the rotating shaft 38. A spring 42 is installed between the detection convex block 39 and the detection groove 40. Pressure sensors 41 fixed to the detection slot 40 are provided at both ends of the spring 42. During the supply process, the film passes through the two tension rollers 19 of the tension detection mechanism 7 in an S shape. Under the support of the spring 42, the detection protrusion 39 of the film will not contact the pressure sensor 41 under normal tension. If the tension is too high or too low, the tension roller 19 will drive the tension detection mechanism 7 to tilt, causing the detection protrusions 39 on both sides of the rotating shaft 38 to move in the detection slot 40. When the detection protrusion 39 contacts the pressure sensor 41, it indicates that the tension exceeds the set threshold. The supply motor 6 is adjusted in time by the single-chip microcomputer to ensure the stability of the film supply tension. By turning the adjusting nut 37, the screw 35 is driven to rotate, and the rotational motion is converted into linear motion under the friction with the second slider 36, so that the spacing of the tension rollers 19 is adjusted by the second slider 36.

[0048] A feeding method of a film feeding mechanism for a cold stretch hood packaging machine comprises the following steps:

[0049] Step 1: Driven by the supply motor 6, the roller 4 is driven to rotate, and the silicone sleeve pressure roller shaft 5 is used to release the film in the unwinding roller 3;

[0050] Step 2: After passing through the bottom roller 8, the film enters the tension detection mechanism 7. The film passes through the tension roller 19 on the tension detection mechanism 7 in an S shape, and the tension is determined by the inclination of the tension detection mechanism 7. The controller is used to adjust the supply motor 6 to keep the tension of the film constant during the supply process.

[0051] Step 3: After the tension is adjusted, the film enters the film cleaning mechanism 9. The cleaning roller 20 on the film cleaning mechanism 9 rotates synchronously with the rotation of the roller 4, and the felt 46 on the surface is used to clean the dust and impurities passing through the felt. At the same time, the inner cavity of the cleaning roller 20 is kept at a negative pressure through the vacuum tube 45, and the cleaned dust and impurities are adsorbed and collected through the adsorption groove 47;

[0052] Step 4: The surface-cleaning film passes through the top of the mold adjustment shaft 11 and is transported downward in a vertical position relative to the horizontal plane;

[0053] Step 5. After entering the movable frame 14, with the cooperation of the lifting transmission mechanism, the movable frame 14 and the film descend at the same speed, and at the same time, the internal straightening mechanisms 29 approach each other until they fit the film, and the contact belt 31 in the straightening mechanism 29 moves toward the outside, continuously smoothing the surface of the film, and after moving down to the set distance, the straightening mechanism 29 automatically separates from the film, and at the same time the movable frame 14 is lifted and reset, and the above steps are repeated.

[0054] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A film supply mechanism for a cold stretch hood packaging machine, comprising two frames (1), wherein the upper ends of the inner sides of the frames (1) are each provided with an upper fixed frame (2) extending backwards, and an unwinding roller (3) is rotatably mounted between the upper fixed frames (2); Features: Also includes: A mounting frame (18) is arranged at the middle position of the rear end of the frame (1), and the mounting frame (18) is fixed to the frame (1) by bolts. A roller (4) is rotatably mounted on one side of the upper horizontal plate of the mounting frame (18), and a silicone sleeve pressure roller shaft (5) rotatably connected to the upper horizontal plate of the mounting frame (18) is provided below the roller (4). A supply motor (6) is installed outside the upper horizontal plate of the mounting frame (18), and the output shaft of the supply motor (6) is fixed to the shaft of the roller (4) by a coupling. A lower fixed frame (12) is arranged below the front end of the frame (1); an adjusting mechanism (13) is fixedly installed on the outer side of the lower fixed frame (12); a movable frame (14) is installed between the two adjusting mechanisms (13); the movable frame (14) and the adjusting mechanism (13) are slidably limited; the movable frame (14) is vertically reciprocated with the rotation of the roller (4) through a lifting transmission mechanism; a connecting frame (28) is symmetrically installed front and back inside the movable frame (14); straightening mechanisms (29) are installed on both sides of the connecting frame (28); through the lifting transmission mechanism, during the ascending process of the movable frame (14), the distance between the two connecting frames (28) is continuously expanded; conversely, during the descending process of the movable frame (14), the distance between the two connecting frames (28) is continuously reduced.

2. The film supply mechanism for a cold stretch hood packaging machine according to claim 1, characterized in that: A driving pulley (21) is fixedly mounted on the other end of the roller (4), a driving pulley (22) is rotatably mounted at the middle position of one side of the frame (1), and the driving pulley (21) and the driving pulley (22) are connected via a belt transmission, a driven pulley (23) is mounted below the driving pulley (22), the driven pulley (23) is rotatably connected to the frame (1), and the driven pulley (23) and the driving pulley (22) are connected via a belt transmission, a driving bevel gear (24) is fixedly mounted on one side of the driven pulley (23), a driven bevel gear (25) is meshedly mounted at the front end of the driving bevel gear (24), and the shaft of the driven bevel gear (25) is rotatably connected to the adjustment mechanism (13).

3. The film supply mechanism for a cold stretch hood packaging machine according to claim 2, characterized in that: The lifting transmission mechanism comprises a sector gear (32) which is arranged above the inside of the adjusting mechanism (13), and the shaft of the driven bevel gear (25) is connected to the sector gear (32) through a belt transmission, a driving gear (33) is rotatably installed below the inside of the adjusting mechanism (13), and first rack plates (15) are fixedly installed on both sides of the movable frame (14), and the first rack plates (15) are independently meshed with the sector gear (32) and the driving gear (33) respectively.

4. The film supply mechanism for a stretch hood packaging machine according to claim 3, characterized in that: The lifting transmission mechanism also includes a second rack plate (16), the second rack plate (16) is fixed to the adjustment mechanism (13) through a fixing rod, and the lower end of the second rack plate (16) extends to the inside of the movable frame (14), and double-threaded transmission rods (26) are rotatably installed on both sides of the inside of the movable frame (14), a first transmission gear (17) is fixedly installed at the middle position of the double-threaded transmission rod (26), and one side of the first transmission gear (17) is meshed and connected with the second rack plate (16), and first sliders (27) are installed at the front and rear of the outside of the double-threaded transmission rod (26), the inner screw hole of the first slider (27) is connected to the double-threaded transmission rod (26) by threading, and the two ends of the connecting frame (28) are respectively fixed to the first slider (27).

5. The film supply mechanism for a cold stretch hood packaging machine according to claim 4, characterized in that: The straightening mechanism (29) comprises two transmission rollers (30), and the transmission rollers (30) are rotatably connected to the connecting frame (28), a contact belt (31) is installed between the two transmission rollers (30), and one of the transmission rollers (30) is driven by a motor.

6. The film supply mechanism for a stretch hood packaging machine according to claim 5, characterized in that: A film cleaning mechanism (9) is arranged between the middle positions of the two frames (1), a driving gear (43) is rotatably mounted on the upper part of the film cleaning mechanism (9), a driven gear (44) is rotatably mounted on the lower part of the film cleaning mechanism (9), and the driving gear (43) is meshedly connected with the driven gear (44), the shaft inside the driving pulley (21) and the shaft of the driving gear (43) are fixed via a coupling, and the driving gear (43) and the driven gear (44) are meshedly connected with each other. A cleaning roller (20) is installed on the shaft at the other end, and the cleaning roller (20) is of a hollow structure. The outer wall of the cleaning roller (20) is provided with a plurality of felts (46) distributed in an annular shape and at equal intervals. Adsorption grooves (47) connected to the hollow cavity of the cleaning roller (20) are provided between adjacent felts (46). A vacuum tube (45) is installed at the other end of the cleaning roller (20), and the vacuum tube (45) is rotatably sealed with the cleaning roller (20). The other end of the vacuum tube (45) is connected to a dust collecting device.

7. The film supply mechanism for a stretch hood packaging machine according to claim 6, characterized in that: The front end of the roller (4) is provided with a tension detection mechanism (7), the tension detection mechanism (7) comprises two tension rollers (19) spaced apart from each other in the upper and lower parts, the tension detection mechanism (7) is provided with limit slide grooves (34) in the upper and lower parts, a screw rod (35) is rotatably mounted in the inner part of the limit slide groove (34), a second slider (36) is mounted on the outer part of the screw rod (35), the inner thread of the second slider (36) is threadedly connected to the screw rod (35), and the outer side of the second slider (36) is connected to the tension roller (19) via a rotating shaft, and the upper and lower ends of the tension detection mechanism (7) are provided with An adjusting nut (37) is connected to the screw rod (35); a detection slot (40) is provided at a position of the upper horizontal plate of the mounting frame (18) corresponding to the tension detection mechanism (7); a rotating shaft (38) is rotatably installed inside the detection slot (40), and one end of the rotating shaft (38) is fixed to the tension detection mechanism (7); detection convex blocks (39) are integrally formed on both sides of the rotating shaft (38); a spring (42) is installed between the detection convex block (39) and the detection slot (40); and pressure sensors (41) fixed to the detection slot (40) are provided at both ends of the spring (42).

8. The film supply mechanism for a stretch hood packaging machine according to claim 7, characterized in that: A mold adjusting frame (10) is installed at the upper end of the outer side of the frame (1), and one end of the mold adjusting frame (10) is fixed to the frame (1) by an adjusting bolt, and a mold adjusting shaft (11) is installed between the other ends of the two mold adjusting frames (10).

9. The film supply mechanism for a stretch hood packaging machine according to claim 8, characterized in that: A bottom roller (8) is installed on the inner side of the lower vertical plate of the mounting frame (18).

10. The supply method of the film supply mechanism for the stretch hood packaging machine according to claim 9, characterized in that: The steps include: Step 1: Driven by the supply motor (6), the roller (4) is driven to rotate, and the silicone sleeve pressure roller shaft (5) is used to release the film in the unwinding roller (3); Step 2: After passing through the bottom of the bottom roller (8), the film enters the tension detection mechanism (7), and the film passes through the tension roller (19) on the tension detection mechanism (7) in an S shape, and the magnitude of the tension is determined by the inclination of the tension detection mechanism (7). The controller is used to adjust the supply motor (6) so that the tension of the film is constant during the supply process; Step 3: After the tension is adjusted, the film enters the film cleaning mechanism (9), and the cleaning roller (20) on the film cleaning mechanism (9) rotates synchronously with the rotation of the roller (4), and the dust and impurities passing through the felt (46) are cleaned by the felt on the surface. At the same time, the inner cavity of the cleaning roller (20) is kept at a negative pressure through the vacuum tube (45), and the cleaned dust and impurities are adsorbed and collected through the adsorption groove (47); Step 4: The surface-cleaned film passes through the top of the mold adjustment shaft (11) and is transported downward in a vertical position relative to the horizontal plane; Step 5. After entering the movable frame (14), with the cooperation of the lifting transmission mechanism, the movable frame (14) and the film descend at the same speed, and at the same time, the internal straightening mechanisms (29) approach each other until the film is attached, and the contact belt (31) in the straightening mechanism (29) moves outward to continuously smooth the surface of the film. After moving down to a set distance, the straightening mechanism (29) is automatically separated from the film, and the movable frame (14) is lifted and reset, and the above steps are repeated.

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